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                     DistributionpatternandcharacteristicsofsedimentationintheLowerYellowRiver

                             MAZipu,WUBaosheng,SHENYi,XUEYuan,QINChao,WANGGe
                           (StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing 100084,China)


                  Abstract:TorevealthedistributionpatternandcharacteristicsofsedimentationalongtheLowerYellow River
                  (LYR),aseriesofstatisticalanalyseswereconductedbasedonthemeasureddataofsedimentationineachsection
                  ofLYRfrom1952to2021.Itwasfoundthat :(1)Therearesevenlongitudinaldistributionpatternsofsedimenta
                  tion,amongwhichthewhole - lineerosion,thewhole - linedeposition,theuppererosionandlowerdeposition,
                  theupperdepositionandlowererosionarethefourmainpatterns.Thecriticalpositionoftheupperdepositionand
                  lowererosionpatternisnearSunkoustation ,andthecriticalpositionoftheuppererosionandlowerdepositionpat
                  ternisinthewanderingriversection.Thereisabigdifferenceinthecontributionrateofeachpatterntotheoverall
                  sedimentationoftheriverchannel.Thelargestcontributionratetotheamountoferosionisthepatterndepositingin
                  themiddleanderodingintheupperandlowerreaches ,andthelargestcontributionratetotheamountofdeposition
                  isthepatternofwhole - linedeposition.(2)Thevariationprocessofthelongitudinaldistributionpatternofsedimen
                  tationsince1952canbedividedintofourstages :1953 - 1959,1960 - 1985,1986 - 1999andafter2000.(3)The
                  distributionoftheamountofsedimentationineachriversectionismainlyanormalorskeweddistributioncentered
                  on0point.Thefluctuationoftheamountofsedimentationhasthetrendofdownstreamdecreasingatthemulti - year
                  scaleandtheperiodiccharacteristicsofalongtimeoferosionwillsilt ,alongtimeoferosionwillscour.(4)The
                  overallfrequencyofsedimentationineachriversectionisnotmuchdifferent ,reflectingtheequilibriumtendencyof
                  riversedimentation.Inthepast70years ,onlyabouthalfofthesedimentdepositedattheriverbedintheLower
                  YellowRiverhasbeenwashedaway.Thecumulativeamountofsedimentationfrom HuayuankoustationtoSunkou
                  stationiscloseto80% ofthetotalamountofsedimentationinthelowerreaches ,andtheriverbelowSunkoustation
                  isverysmall.(5)Thewhole - lineerosionisthemainpatternaftertheoperationoftheXiaolangdiReservoir.The
                  sedimentdeposi4tedintheearlystageoftheXiaolangdi - Huayuankousectionisbasicallywashedout,andtheJia
                  hetan - Aishansectiononlywashedaway20% to30% ofthesedimentdepositedintheearlystage.Theresultssum
                  marizedthedistributionpatternsofsedimentationandanalyzedthedistributioncharacteristicsofsedimentation ,
                  whichwashelpfultodeepentheoverallunderstandingofsedimentationphenomenaintheLowerYellowRiver.
                  Keywords:LowerYellowRiver;theamountofsedimentation;longitudinaldistributionpattern;whole - lineero
                  sion ;whole - linedeposition

                                                                                    (责任编辑:李福田)



















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